scholarly journals Pulse Oximeter Oxygen Saturation in Prediction of Arterial Oxygen Saturation in Liver Transplant Candidates

2014 ◽  
Vol 14 (3) ◽  
Author(s):  
Seiyed Mohammad Ali Ghayumi ◽  
Abolfazl Khalafi-Nezhad ◽  
Zahra Jowkar
Keyword(s):  
Liver Transplant ◽  
Oxygen Saturation ◽  
Pulse Oximeter ◽  
Arterial Oxygen Saturation ◽  
Arterial Oxygen ◽  
Transplant Candidates

scholarly journals Is pulse oximeter a reliable tool for non-critically ill patients with COVID-19?

2021 ◽  
Author(s):  
Aslıhan Gürün Kaya ◽  
Miraç Öz ◽  
İREM AKDEMİR KALKAN ◽  
Ezgi Gülten ◽  
güle AYDIN ◽  
...  
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximeter ◽  
Lymphocyte Count ◽  
Arterial Oxygen Saturation ◽  
Arterial Oxygen ◽  
Arterial Blood Gas ◽  
Reactive Protein ◽  
Arterial Blood ◽  
The Difference ◽  
Clinical Conditions

Introduction: Guidelines recommend using a pulse oximeter rather than arterial blood gas (ABG) for COVID-19 patients. However, significant differences can be observed between oxygen saturation measured by pulse oximetry (SpO2) and arterial oxygen saturation (SaO2) in some clinical conditions. We aimed to assess the reliability of pulse oximeter in patients with COVID-19 Methods: We retrospectively reviewed ABG analyses and SpO2 levels measured simultaneously with ABG in patients hospitalized in COVID-19 wards. Results: We categorized total 117 patients into two groups; in whom the difference between SpO2 and SaO2 was 4% (acceptable difference) and >4% (large difference). Large difference group exhibited higher neutrophil count, C-reactive protein, ferritin, fibrinogen, D-dimer and lower lymphocyte count. Multivariate analyses revealed that increased fibrinogen, increased ferritin and decreased lymphocyte count were independent risk factors for large difference between SpO2 and SaO2. The total study group demonstrated the negative bias of 4.02% with the limits of agreement of −9.22% to 1.17%. The bias became significantly higher in patients with higher ferritin, fibrinogen levels and lower lymphocyte count. Conclusion: Pulse oximeters may not be sufficient to assess actual oxygen saturation especially in COVID-19 patients with high ferritin and fibrinogen levels and low lymphocyte count low SpO2 measurements.

scholarly journals First Evaluation of a Newly Constructed Underwater Pulse Oximeter for Use in Breath-Holding Activities

2021 ◽  
Vol 12 ◽  
Author(s):  
Eric Mulder ◽  
Erika Schagatay ◽  
Arne Sieber
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximeter ◽  
Arterial Oxygen Saturation ◽  
Dropout Rate ◽  
Arterial Oxygen ◽  
Breath Holding ◽  
Signal Loss ◽  
Physiological Variables ◽  
Dry Conditions ◽  
Pulse Oximeters

Studying risk factors in freediving, such as hypoxic blackout, requires development of new methods to enable remote underwater monitoring of physiological variables. We aimed to construct and evaluate a new water- and pressure proof pulse oximeter for use in freediving research. The study consisted of three parts: (I) A submersible pulse oximeter (SUB) was developed on a ruggedized platform for recording of physiological parameters in challenging environments. Two MAX30102 sensors were used to record plethysmograms, and included red and infra-red emitters, diode drivers, photodiode, photodiode amplifier, analog to digital converter, and controller. (II) We equipped 20 volunteers with two transmission pulse oximeters (TPULS) and SUB to the fingers. Arterial oxygen saturation (SpO2) and heart rate (HR) were recorded, while breathing room air (21% O2) and subsequently a hypoxic gas (10.7% O2) at rest in dry conditions. Bland-Altman analysis was used to evaluate bias and precision of SUB relative to SpO2 values from TPULS. (III) Six freedivers were monitored with one TPULS and SUB placed at the forehead, during a maximal effort immersed static apnea. For dry baseline measurements (n = 20), SpO2 bias ranged between −0.8 and −0.6%, precision between 1.0 and 1.5%; HR bias ranged between 1.1 and 1.0 bpm, precision between 1.4 and 1.9 bpm. For the hypoxic episode, SpO2 bias ranged between −2.5 and −3.6%, precision between 3.6 and 3.7%; HR bias ranged between 1.4 and 1.9 bpm, precision between 2.0 and 2.1 bpm. Freedivers (n = 6) performed an apnea of 184 ± 53 s. Desaturation- and resaturation response time of SpO2 was approximately 15 and 12 s shorter in SUB compared to TPULS, respectively. Lowest SpO2 values were 76 ± 10% for TPULS and 74 ± 13% for SUB. HR traces for both pulse oximeters showed similar patterns. For static apneas, dropout rate was larger for SUB (18%) than for TPULS (<1%). SUB produced similar SpO2 and HR values as TPULS, both during normoxic and hypoxic breathing (n = 20), and submersed static apneas (n = 6). SUB responds more quickly to changes in oxygen saturation when sensors were placed at the forehead. Further development of SUB is needed to limit signal loss, and its function should be tested at greater depth and lower saturation.

scholarly journals Cerebral Arterial Oxygen Saturation Measurements Using a Fiber-Optic Pulse Oximeter

2010 ◽  
Vol 13 (2) ◽  
pp. 278-285 ◽  
Author(s):  
J. P. Phillips ◽  
R. M. Langford ◽  
S. H. Chang ◽  
K. Maney ◽  
P. A. Kyriacou ◽  
...  
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximeter ◽  
Fiber Optic ◽  
Arterial Oxygen Saturation ◽  
Arterial Oxygen

scholarly journals Performance of the MP570T pulse oximeter in volunteers participating in the controlled desaturation study: a comparison of seven probes

2020 ◽  
Vol 15 (3) ◽  
pp. 371-377
Author(s):  
Byung-Moon Choi ◽  
Bong Jin Kang ◽  
Ho-Yong Yun ◽  
Bokyoung Jeon ◽  
Ji-Yeon Bang ◽  
...  
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximeter ◽  
Breathing Circuit ◽  
Arterial Oxygen Saturation ◽  
Arterial Oxygen ◽  
Gas Mixture ◽  
Mean Square ◽  
Peripheral Oxygen Saturation ◽  
Hypoxic Gas Mixture ◽  
Finger Probe

Background: The performance of the pulse oximeter was evaluated based on the ISO 80601-2-61:2011 (E) guidelines. This study aimed to determine whether the various finger probes of the MP570T pulse oximeter (MEK-ICS Co., Ltd., Korea) would provide clinically reliable peripheral oxygen saturation (SpO2) readings over a range of 70100% arterial oxygen saturation (SaO2) during non-motion conditions.Methods: Each volunteer (n = 12) was connected to a breathing circuit for the administration of a hypoxic gas mixture. For frequent blood sampling, an arterial cannula was placed in a radial artery. The following seven pulse oximeter probes were simultaneously attached to each volunteer’s fingers: (1) WA-100 reusable finger probe (MEDNIS Co., Ltd., Korea), (2) MDNA disposable finger probe (MEDNIS Co., Ltd.), (3) IS-1011 disposable finger probe (Insung Medical Co., Ltd., Korea), (4) CJ340NA disposable finger probe (CHUN JI IN Medical Co., Ltd., Korea), (5) NellcorTM OxiMax DS-100A reusable finger probe (Medtronic, USA), (6) NellcorTM OxiMax MAX-N disposable finger probe (Medtronic), and (7) OXI-PRO DA disposable finger probe (Bio-Protech Inc., Korea). Results: A total of 275 SpO2-SaO2 pairs were included in the analysis. The accuracy of the root mean square (Arms) of each probe was 2.83%, 3.98%, 3.75%, 6.84%, 3.43%, 5.17%, and 3.84%, respectively.Conclusions: The MP570T pulse oximeter with WA-100 reusable, MDNA disposable, IS-1011 disposable, NellcorTM OxiMax DS-100A reusable, and OXI-PRO DA disposable finger probes meets an acceptable standard of SpO2 accuracy under non-motion conditions.

EVALUATION OF THE OHMEDA BIOX 3700 PULSE OXIMETER DURING RAPID CHANGES IN ARTERIAL OXYGEN SATURATION

1986 ◽  
Vol 65 (Supplement 3A) ◽  
pp. A131 ◽  
Author(s):  
R. S. Berko ◽  
D. M. Kagle ◽  
C. M. Alexander ◽  
M. Giuffre ◽  
J. B. Gross
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximeter ◽  
Arterial Oxygen Saturation ◽  
Arterial Oxygen ◽  
Rapid Changes

scholarly journals Accuracy and precision of pulse oximeter at different sensor locations in patients with heart failure

2021 ◽  
Vol 16 ◽  
Author(s):  
Alaa Thabet Hassan ◽  
Soher Mostafa Ahmed ◽  
Azza Salah AbdelHaffeez ◽  
Sherif A.A. Mohamed
Keyword(s):  
Heart Failure ◽  
Oxygen Saturation ◽  
Pulse Oximetry ◽  
Pulse Oximeter ◽  
Arterial Oxygen Saturation ◽  
Arterial Oxygen ◽  
St Segment Elevation ◽  
Accuracy And Precision ◽  
St Segment ◽  
Patients With Heart Failure

Background: Despite its wide use in clinical practice, few studies had assessed the role of pulse oximetry in patients with heart failure. We aimed to evaluate the accuracy and precision of the pulse oximeter in patients with heart failure and to determine this accuracy at three different sensor locations.Methods: Comparison of pulse oximetry reading (SpO2) with arterial oxygen saturation (SaO2) was reported in 3 groups of patients with heart failure (HF); those with ejection fraction (EF) >40%, those with EF <40%, and those with acute HF (AHF) with ST and non-ST segment elevation acute myocardial infarction (STEMI and non-STEMI).Results: A total of 235 patients and 90 control subjects were enrolled. There were significant differences in O2 saturation between control and patients’ groups when O2 saturation is measured at the finger and toe, but not the ear probes; p=0.029, p=0.049, and 0.051, respectively. In HF with EF>40% and AHF with O2 saturations >90%, finger oximetry is the most accurate and reliable, while in HF with EF<40% and in patients with AHF with O2 saturations <90%, ear oximetry is the most accurate.Conclusion: Pulse oximetry is a reliable tool in assessing oxygen saturation in patients with heart failure of different severity. In HF with EF>40% and in AHF with O2 saturations >90%, finger oximetry is the most accurate and reliable, while in HF with EF<40% and in patients with AHF with O2 saturations <90%, ear oximetry is the most accurate. Further studies are warranted.

Clinical evaluation of noninvasive monitoring of oxygen saturation in critically ill patients

1998 ◽  
Vol 7 (5) ◽  
pp. 370-373 ◽  
Author(s):  
P Smatlak ◽  
AR Knebel
Keyword(s):  
Cardiac Index ◽  
Oxygen Saturation ◽  
Pulse Oximetry ◽  
Pulse Oximeter ◽  
Arterial Oxygen Saturation ◽  
Arterial Oxygen ◽  
Pulmonary Capillary ◽  
Margin Of Error ◽  
Accuracy Of Measurement ◽  
Clinical Conditions

OBJECTIVE: To examine the effect of abnormal cardiac index on the accuracy of measurement of oxygen saturation by pulse oximetry. METHODS: Forty-six patients (mean age, 49 years) in a 9-bed medical ICU were studied. Measurements of oxygen saturation obtained with pulse oximeters and with a functional cooximeter were collected at baseline and 4, 8, 16, 24, 32, 40, and 48 hours later. Hemodynamic and cardiopulmonary parameters were recorded. RESULTS: The Bland-Altman technique yielded upper and lower limits of agreement of 2.53% and -7.11%. Most (95.7%) of the differences between the measurements of oxygen saturation obtained with the 2 methods were within these limits, although some of these differences may be clinically unacceptable. The bias was -2.29%, and the precision was 2.41%. The clinical conditions associated with inaccurate tracking of saturation by pulse oximetry across the range of actual arterial oxygen saturation values were abnormal cardiac index, partial pressure of carbon dioxide, heart rate, and pulmonary capillary wedge pressure. CONCLUSIONS: In patients with abnormal cardiac index, the pulse oximeter measurements exceeded the actual oxygen saturation by up to 7%. Pending prospective studies, clinicians should be aware that when certain cardiopulmonary parameters are abnormal, the margin of error in measurements of oxygen saturation obtained with a pulse oximeter may be greater than when those parameters are normal.

scholarly journals Measurements of cerebral arterial oxygen saturation using a fiber-optic pulse oximeter

2009 ◽  
Author(s):  
Justin P. Phillips ◽  
Richard M. Langford ◽  
Serene H. Chang ◽  
Kishore Maney ◽  
Panayiotis A. Kyriacou ◽  
...  
Keyword(s):  
Oxygen Saturation ◽  
Pulse Oximeter ◽  
Fiber Optic ◽  
Arterial Oxygen Saturation ◽  
Arterial Oxygen

Effects of Skin Pigmentation on Pulse Oximeter Accuracy at Low Saturation

2005 ◽  
Vol 102 (4) ◽  
pp. 715-719 ◽  
Author(s):  
Philip E. Bickler ◽  
John R. Feiner ◽  
John W. Severinghaus
Keyword(s):  
Carbon Dioxide ◽  
Oxygen Saturation ◽  
Pulse Oximeter ◽  
Arterial Oxygen Saturation ◽  
Skin Pigmentation ◽  
Arterial Oxygen ◽  
Dark Light ◽  
Light Skin ◽  
End Tidal ◽  
Pulse Oximeters

Background It is uncertain whether skin pigmentation affects pulse oximeter accuracy at low HbO2 saturation. Methods The accuracy of finger pulse oximeters during stable, plateau levels of arterial oxygen saturation (Sao2) between 60 and 100% were evaluated in 11 subjects with darkly pigmented skin and in 10 with light skin pigmentation. Oximeters tested were the Nellcor N-595 with the OxiMax-A probe (Nellcor Inc., Pleasanton, CA), the Novametrix 513 (Novametrix Inc., Wallingford, CT), and the Nonin Onyx (Nonin Inc., Plymouth, MN). Semisupine subjects breathed air-nitrogen-carbon dioxide mixtures through a mouthpiece. A computer used end-tidal oxygen and carbon dioxide concentrations determined by mass spectrometry to estimate breath-by-breath Sao2, from which an operator adjusted inspired gas to rapidly achieve 2- to 3-min stable plateaus of desaturation. Comparisons of oxygen saturation measured by pulse oximetry (Spo2) with Sao2 (by Radiometer OSM3) were used in a multivariate model to determine the interrelation between saturation, skin pigmentation, and oximeter bias (Spo2 - Sao2). Results At 60-70% Sao2, Spo2 (mean of three oximeters) overestimated Sao2 (bias +/- SD) by 3.56 +/- 2.45% (n = 29) in darkly pigmented subjects, compared with 0.37 +/- 3.20% (n = 58) in lightly pigmented subjects (P &lt; 0.0001). The SD of bias was not greater with dark than light skin. The dark-light skin differences at 60-70% Sao2 were 2.35% (Nonin), 3.38% (Novametrix), and 4.30% (Nellcor). Skin pigment-related differences were significant with Nonin below 70% Sao2, with Novametrix below 90%, and with Nellcor at all ranges. Pigment-related bias increased approximately in proportion to desaturation. Conclusions The three tested pulse oximeters overestimated arterial oxygen saturation during hypoxia in dark-skinned individuals.

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